Sand-cutting machine



June 4, 1929. F. GRAF 1.715.355

SAND CUTTING MACHifiE Filed Aug. 17, 1926 3 Sheets-Sheet l INVENTOR ATTORNEY June 4, 1929. F. GRAF SAND CUTTING MACHINE Filed Aug. 17, 1926 3 Sheets-Sheet 2 fiLLIIlVENTOR BY 2 ATTORN EY June 4, 1 929. Y v F 1,715,355

A SAND CUTTING MACHINE Filed Aug. 17, 1926 3 Sheets-Sheet 3 INVENTOR M ATTORN EY Patented June 4, i929.

FRED GRAB, OF SOUTH BEND, INDIANA, ASSIGNOR TO AMERICAN FOUNDRY EQUIP- MENU. COMPANY, OF NEW YORK, N. Y., A CORPORATION OF OHIO.

sewn-comma MACHINE.

Application filed Au ust 17, 1926. Serial No. 129,676.

My invention relates to a sand cutting ma chine designed to be used 1n foundries for treating sand used 1n molding. My invention relates more particularly to a cutting device 7 amount of sand slides off from the ends of the blades leaving a row of sand on each side of the machines as it movesover the floor.

. The present invention provides a sand cutting and piling machinecapable of thoroughly cutting the sand and placing it in a ridge or row, eliminating side spill and leaving the floor in a cleaner state. This is accomplished by providing a blade structure comprising a series of generally radial blades for cutting, mixing and piling the sand and a helical blade disposed at each end of the radial blades. The helical blades, in revolving, cut into the sand and force it toward the center of the machine where it is operated upon by the radial blades in the manner above stated.

The helical blades, in addition to forcing the sand from the sides of the machine t0v the central blades and preventing any substan tial amount of material from escaping at the sides, serve to thoroughly mix and aerate the sand and insure a more'satisfactory and complete operation of the machine.

As, the machine constructed in accordance with this invention is passed over the floor the sand is completely mixed, aerated and removed to form a neat center ridge or pile. N0 ridges of sand are left at the sides which would require re-running the machine with consequent loss of time and expense and the sand is substantially and completely recovered in one operation.

' Various other features and advantages of the invention will be obvious from the fol lowing particular description of one form of mechanism embodying the invention or from an inspection of the accompanying draw.- ings; and the invention also consists in certain new and novel features of construction In machines of the above character a certain and combination of parts hereinafter set forth and claimed. I

In the accompanying drawings I have shown for the purposes of "illustration one form of mechanismembodying the invention, in which: i :3 Fig. 1 is a side elevation of the cutting cylinder; i

Fig. 2 is a view of the machine incorporatmg the cutting cylinder; Fig. 3 is a section on the line 3-3 of Fig. 1; gig. at is a section on the line 4.%l of'Fig. 1; an 7 inder. V v I In the following description an'dflin the.

Fig. 5 is an endview of the cutting cyl- 7 claims, parts will be identified by specific names for convenience, but they are intended to be as generic in their application to similar-I parts as the art will permit.

Referring to the drawings the machine may be of any type and preferably has a frame mounted on wheels adapted to be run over the floor on which lies the sand to be treated. The cutting cylinder is carried by a shaft 20 rotatably mounted in an adjustable machine body permitting the cutting cylinder to be raised and lowered with respect to the sand to be treated. The cutting cylinder comprises center members 25 for cutting and mixing the sand, and end members 26 for swinging frame 21 which is pivoted to the conveying sand into position where it may be cut and mixed by the center members. i l

" Along the shaft 20 at spacedintervals 'splders 30 are mounted so as to be rotatable therewith. Each of these spiders comprises spoke like members 31 connecting the ri1n32 to a hub 33 which is'rigidly secured to the shaft 20. f The center cutting and mixing blades 25 are mounted on the spiders 30 by means of brackets 35 supported on the rims 32 of the spiders. Each bracket 35 may be of any suitable construction. As shown, it comprises a base 36, an arm 37 and a rib 38. The base 36 of the bracket is slightly curved to conform to the periphery of the riin 32 on which it is mounted.

The arm 37 of the bracket rises at substantially right angles to the base 36, and is shaped so as to conform to the spiral contourvof the blade,to which the arm is secured. The rib 38 extends from the base 36 to the upper end of the arm 37 so as to re-enforce the bracket. As shown in the drawing the center piling and mixing blades 25 are in two sets 40 and 41, and the cutting blades 25 of each set have 7 their broad, flat sides to act as paddles in lifting and tossing the material. The blades 43 of one set are similarly inclined in an opposite direction to the blades 44 of the other set 41, with the result that the'material is worked toward the center and ridged in the rear of the machine; The blades have a staggered or alternate arrangement, the blades 43.

of one set being located opposite the spaces between the blades 44 of the other set so that the blades of the two sets will alternately and successively act upon the material, and in passing through the latter impart a whirling or vortex motion thereto, thereby 'ra'pidlyand thoroughly breaking and separating the sand.

.The conveyor blades 26 are supported at.

each end of the shaft by the last two spiders and 51 which are shown spaced apart more widely than are the intermediate spiders 52.

Each conveyor blade 26 is in the form of a helix, and has its extreme ends 54 and 55 secured by means of brackets 53 to the rims 56 and 57 respectively of the last two spiders 50 and51 and has its intermediate helical portion58 supported by brackets 59 mounted on tie bars 60 connected between the rims 56 and 57' of the spiders 50 and 51. The conveyor blades 26011 either end are of opposite pitch so that when rotated they will draw material in from the ends toward the center.

The'nurnber of tie bars 60 may be varied, six being shownby way of illustration in the drawings. 'These tie bars are shown dist-ributed evenly around the periphery of the spiders 50 and 51 and are positioned parallel with respect to the shaft 20, with their ends secured to the outer faces ofthe rims, 56 and 57.- V

The brackets are similar in construction. Each bracket 65 is substantially T-shaped in form, having its base 66 supported on spider rim 5'? or 58 or on one ofthe tie bars 60 and its stem 67 and head 68 shaped to conform to the spiral face of the'conveyor blade 26 to which the bracketmay be secured by any suitable means, as by bolts or rivets 69.

In operation the revolving cylinder will.

operate to convey and sweep the outer .portions of the sand to the center cutting and mixing blades, during which action the sand receives an aerating and mixing action.

By the construction according to the invent-ion a cutting cylinder is provlded which permits the sand to be cut and mixed in a pointed out in the annexed claims certain 7 novel features of the invention, it will be understood that various omissions, substitutions and changes n the forms and details of the device illustrated and in its operation may be made by those skilled in the art without departing from-the spirit of theinvention.

: What is claimed is: Q

1. In a cutting device for a sand cutting machine, the combination with blades for mixing the sand, of blades for conveying the sand to said mixingfblades, means for sup porting said mixing blades intermediate said conveying blades, said conveying blades be ing formed as helices, the pitch of one helix being opposite to that o f'the other helix to permit the conveying blades'to draw sand inwardly from each end toward the mixing blades, said mixing blades being form'edin two sets, the blades of each set having a. parallel relation to one another and positioned in a diagonal direction with their width on radial lines, the blades of one set being simil-' larly inclinedin anopposite direction to the blades of the other set and having a staggered arrangement, the blades of one set being located opposite the spaces between the blades of the otherset. Y

2. In combination with a sand cutting machine, a sandtreating device comprising a plurality of centrally disposed, diagonally extending, cutting blades and helical blades arranged on each side thereof for conveying sand to said cutting blades.

3. A device for treatingline materials com ends thereof toward the cutting andpiling blades.

5.- In combination with a sand cutting machine, a rotating sand" treating member, a pair of oppositely inclined sets of helical blades disposed on opposite sides of the central portion of said member, said blades being. adapted to cut sand and pile the same centrally, and a pair of helical blades disposed on opposite sides of said first mentioned blades for conveying material thereto and preventing said material from passing around the ends thereof.

6. A sand cutting and piling machine including a rotating sand treating member having a plurality of sets of diagonally extending helical blades, said blades being of opposite pitch on opposite sides of said mem- 10 ber whereby the material treated thereby may be urged toWard the center, the blades on each side of said center being divided into two groups, one of said groups having a comparatively steep pitch and the other of said groups having a small pitch, said first mentioned group being adapted to pile said divided into a plurality of groups, the groups on opposite sides of said member being oppositely inclined and the tWo central groups being of comparatively steep pitch and having the ends overlapping and alternately disposed and the end groups having a comparatively small pitch and being adapted to convey material to said center group.

In'testimony whereof I have hereunto set my hand.

FRED GRAF. 

